Exam 53: Engine Diagnosis and Service: Block, Crankshaft, Bearings, and Lubrication System

Uneven rod bearing wear, and sometimes piston skirt wear, usually indicates a(n) ____.

Glaze breakers remove metal at a much faster rate than the rigid hones that are used to finish a cylinder to the correct size after boring.

What is the purpose of the crosshatch?

Which of the following statements is LEAST-Likely true?

While having a discussion, Technician A says that a front bearing with excessive clearance will knock. Technician B says that excessive clearance can cause low oil pressure. Who is correct?

____________________ occurs when excessive piston-to-cylinder wall clearance allows the piston skirt to tap against the cylinder wall.

Explain how the stones on a spring-loaded glaze breaker can be accidentally broken.

Crosshatching that is too steep (less than 60 degrees) will allow oil to run down the cylinder wall; too flat (more than 20 degrees) causes too thick an oil film.

All of the following statements are true EXCEPT:

The crankshaft can be checked for obvious cracks by "____________________" the counterweights with a light tap of a hammer.

____________________ after boring provides a much more satisfactory surface for new rings and promotes longer ring life.

Why is it not advisable to sand bearings with an emery cloth?

____ occurs when the load on the engine is greater than the rpm needed to develop enough horsepower to pull the load.

The part that will MOST-Likely be easily bruised or distorted during installation of pressed-fit oil pickup screens is the:

Too much taper wear is also accompanied by out-of-round (oval) wear, which results when the piston rocks on its wrist pin at top dead center and bottom dead center.

Briefly describe the procedure recommended by Federal-Mogul Corporation for positioning the oil hole.

While having a discussion,Technician A says that a plugged screen can ruin a new engine in a very short time. Technician B says that a plugged screen has no effect on the engine. Who is correct?

All of the following statements are true EXCEPT:

____________________ are used to repair a cracked or damaged cylinder.

A crankshaft sometimes wears excessively because of abrasives in the ____________________.